A SECOND OHIO WEED MANUAL. 



307 



22 Crab=grass (A) Syntherisnta sanguinalis (L.) Dulac. To one who cares for 

 a large, much trodden-down lawn or a tasty garden, crab-grass makes good mid- 

 summer rains almost a burden; following these 

 showers it springs up in nearly all early grass 

 tracts, in gardens, meadows and cultivated 

 fields. Its stems strike root where they touch 

 the earth and most careful labor is required to 

 clean it out. Withal it is highly nutritious, 

 and often furnishes one or two crops of hay in 

 southern (Tennessee) grainfields. In Ohio it 

 ranks as a pest so far as known to the writer. 

 It is also called Polish millet. Fig. 5 shows 

 the appearance of the weed. 



Seeds straw-color, 1-10 in. long, like old- 

 witch grass but longer and more pointed. (See 

 seed figures. ) 



Thorough, late tillage to destroy all plants 

 and seeds will be required to get rid of this 

 weed. 



23 Slender Finger=grass (A) Syntherisma 

 filifoimis (L.) Nash, and 24 Small Crab=grass 

 (A) *Syntherisma linearis (Krock) Nash, more es- 

 pecially the latter, are species closely related 

 to crab-grass that ma} r be met with. For 

 Fig. 5. Crab-grass. practical purposes their possible confusion with 



the common weedy species will not be a matter of importance at the same time 

 that the critical student will wish to distinguish them. 



25 Foxtail, Pigeon=grass(A) -Chaetochloa glauca (L.) Scribn. The common 

 or yellow foxtail with dense, spiked heads like millet, is everywhere known, I 

 comes in cultivated fields aftercrops are laid by, in stubble, in lawns, meadows 

 and in pastures. It also springs up where any vacant space is left in the oat 

 fields, as between plots of Station work. The bristles in the dense heads are 

 upwardly barbed. 



Seeds flattened on one side, 1-8 inch long and more than half as wide, straw- 

 color to dark brown, with dense, transverse wrinkles all over them. Very com- 

 mon in clover seed, millet and seeds of late grasses. (See seed cuts.) 



Late cultivation, cutting, burning or other seed destruction is required in 

 subduing this grass. Its seeds are evidently stored in most cultivated soils. 

 This weed is attacked by a smut, Ustilago panici-glanci (Wallr.) Wint., which 

 destroyed the seeds to a measurable extent about the Station in 1896-1897; this 

 smut does not attack grains. 



26 Green Foxtail, Bottle=grass (A) * Chaetochloa viridis (L. ) Scribn. Re- 

 sembles the common yellow foxtail, but has a green head and usually green 

 bristles. The heads are more tapering towards the tip. Occurring in rich, 

 cultivated fields. 



Seeds. 1-16 inch long, resembling the last but with slightly different mark- 

 ings. (See seed cuts.} This grass should be destroyed like the common foxtail. 



27 FoxtaiUgrass (A) *Chaetoc/i/oa verfiril/afa (L.)Scribn. This, the third o 

 the prevalent foxtail grasses is distinguished from green foxtail by the upward 

 barbing of the bristles. The seeds are large like those of the latter species, 

 partly light-colored and partly dark, about 1-16 inch long, with indistinct mark- 

 ings as shown in the illustration in the seed cuts. This is to be dealt with in 

 the same manner as the other species. 



